US3819546A - Antilumping expandable styrene polymers - Google Patents
Antilumping expandable styrene polymers Download PDFInfo
- Publication number
- US3819546A US3819546A US00358531A US35853173A US3819546A US 3819546 A US3819546 A US 3819546A US 00358531 A US00358531 A US 00358531A US 35853173 A US35853173 A US 35853173A US 3819546 A US3819546 A US 3819546A
- Authority
- US
- United States
- Prior art keywords
- particles
- parts
- poly
- methyl methacrylate
- beads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
Definitions
- This invention relates to a process for making expandable styrene polymer particles non-lumping on pre-expansion.
- the particles are generally pre-expanded before introduction into the mold to provide better fusion and less density variation in the molded article.
- Such a preexpansion is described in U.S. Pat. No. 3,023,175 and U.S. Pat. No. 3,577,360.
- pre-expanded particles are placed into a mold cavity which defines the shape of the desired finished article.
- the particles are heated above their softening point, whereupon the particles expand to fill the mold cavity and fuse together.
- anti-lumping, preexpanded particles are produced by coating styrene polymer particles with a poly(methyl methacrylate) applied to the particles in an aqueous suspension prior to impregnating the particles with expanding agent.
- the methacrylate must be added to the suspension system prior to the addition of the styrene polymer particles.
- thermoplastic homopolymers and copolymers can be rendered anti-lumping.
- the polymers may be derived from vinyl aromatic monomers including styrene, vinyltoluene, isopropylstyrene, alphamethylstyrene, nuclear methylstyrenes, chlorostyrene,
- tertbutylstyrene etc., as well .as copolymers prepared by the copolymerization of a vinyl aromatic monomer with monomers such as butadiene, alkyl methacrylates, alkyl acrylates, acrylonitrile and maleic anhydride wherein the vinyl aromatic monomer is present in at least 50% by weight of the copolymer.
- monomers such as butadiene, alkyl methacrylates, alkyl acrylates, acrylonitrile and maleic anhydride wherein the vinyl aromatic monomer is present in at least 50% by weight of the copolymer.
- these polymers and copolymers are referred to herein as styrene polymers.
- the styrene polymers can, of course, be produced by any of the known techniques, for example by suspension or mass polymerization, to obtain particles in the form of beads or pellets.
- the blowing agent is incorporated into the particles. as in U.S. Pat. No. 2,983,692, by suspending the particles in water with the aid of suspending agent systems such as tricalcium phosphate in combination with an anionic surfactant.
- the tricalcium phosphate, the anionic surfactant, and water are mixed and thoroughly agitated to form a dispersion.
- the poly(- methyl methacrylate) is then added to the dispersion and agitated.
- Thepolymer particles and the blowing agent are then added and the resulting, suspension heated to impregnate the particles with the blowing agent and coat the particles with the methacrylate polymer.
- Thepoly(methyl methacrylate) is used in amounts of from 0.03 to 0.30 part per 100 parts of polymer particles.
- the methacrylate may be conveniently used as an aqueous latex having 30-40 per cent solids.
- poly( methyl methacrylate) is not important so long as these ingredients are mixed prior to the addition of the polymer particles.
- the blowing agents are compounds which are gases or which will produce gases on heating.
- Preferred'blowing agents include aliphatic hydrocarbons containing from 1-7 carbon atoms in the molecule, such as methane, ethane, propane, butane, pentane, cyclopentane, hexane, heptane, cyclohexane, and their halogenated derivatives which boil at a temperature below the softening point of the polymer. Mixtures of these agents may also be used, such as a mixture of 40-60% npentane and 60-40% trichlorofluoromethane. Usually from 3 to 20% of blowing agent per parts of polymer is incorporated by the impregnation.
- the impregnation is conventionally carried out at temperatures ranging from about 60 to C. Increasing the temperature makes the impregnation proceed at a faster rate.
- the suspension of polymer particles is cooled to room temperatures to allow separation of the impregnated beads from the aqueous phase.
- the coated, impregnated particles are separated from theaqueous phase by the usual means, such as centrifugation after acidification with hydrochloric acid. The particles are then washed with water and dried.
- the coating process of the present invention may also be applied to polymer particles which contain various EXAMPLE 1
- a 12-020 crown capped bottle was added in sequence 100 parts of water, 0.0047 part of sodium dodecylbenzene sulfonate, 0.05 part of poly(methyl methacrylate) (added as aqueous latex having about 30% solids), and 2.0 parts of tricalcium phosphate.
- the mixture was stirred for several minutes to insure complete mixing.
- the bottle was then opened and the contents acidified with HCl. The particles were separated from the water, washed with water, and dried.
- a control sample was prepared using the identical procedure except that the methacrylate polymer latex was omitted.
- the beads from the control sample were preexpanded in a Rodman Pre-Expander (US. Pat. No. 3,023,175) to a density of about 1.25 p.c.f.
- the control beads were found to have in excess of 50% lumps.
- Example ll The process of Example I was repeated using amounts of poly(methyl methacrylate) latex varying from 0.03 to 0.3 parts per 100 parts of polystyrene beads. In all cases, the pre-expanded products contained no lumps.
- Example I On recovery of the beads from the two-runs, A and B, the beads were pre-expanded as in Example I.
- the beads from run A had no lumps, whereas those from run B had in excess of lumps.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
Claims (1)
- 2. The process of claim 1 wherein said poly(methyl methacrylate) is in the form of an aqueous latex having 30-40% solids.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00358531A US3819546A (en) | 1973-05-09 | 1973-05-09 | Antilumping expandable styrene polymers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00358531A US3819546A (en) | 1973-05-09 | 1973-05-09 | Antilumping expandable styrene polymers |
Publications (1)
Publication Number | Publication Date |
---|---|
US3819546A true US3819546A (en) | 1974-06-25 |
Family
ID=23410033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00358531A Expired - Lifetime US3819546A (en) | 1973-05-09 | 1973-05-09 | Antilumping expandable styrene polymers |
Country Status (1)
Country | Link |
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US (1) | US3819546A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4080344A (en) * | 1974-03-28 | 1978-03-21 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Process for the production of expandable ethylenically unsaturated polymer particles |
US4269871A (en) * | 1980-06-30 | 1981-05-26 | Arco Polymers, Inc. | Antilumping expandable styrene polymers |
US4698367A (en) * | 1985-12-30 | 1987-10-06 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Expandable thermoplastic resin particles |
US6167892B1 (en) * | 1996-10-17 | 2001-01-02 | Kaneka Corporation | Method for washing prefoamed particles |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3428579A (en) * | 1964-04-01 | 1969-02-18 | Basf Ag | Expandable finely divided plastics compositions |
US3462293A (en) * | 1966-11-07 | 1969-08-19 | Koppers Co Inc | Coated expandable polystyrene |
-
1973
- 1973-05-09 US US00358531A patent/US3819546A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3428579A (en) * | 1964-04-01 | 1969-02-18 | Basf Ag | Expandable finely divided plastics compositions |
US3462293A (en) * | 1966-11-07 | 1969-08-19 | Koppers Co Inc | Coated expandable polystyrene |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4080344A (en) * | 1974-03-28 | 1978-03-21 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Process for the production of expandable ethylenically unsaturated polymer particles |
US4269871A (en) * | 1980-06-30 | 1981-05-26 | Arco Polymers, Inc. | Antilumping expandable styrene polymers |
US4698367A (en) * | 1985-12-30 | 1987-10-06 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Expandable thermoplastic resin particles |
US6167892B1 (en) * | 1996-10-17 | 2001-01-02 | Kaneka Corporation | Method for washing prefoamed particles |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ATLANTIC RICHFIELD COMPANY, 515 FLOWER ST., LOS AN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE JULY 1, 1981.;ASSIGNOR:ARCO POLYMERS, INC., A CORP. OF PA;REEL/FRAME:003944/0516 Effective date: 19810630 |
|
AS | Assignment |
Owner name: ATLANTIC RICHFIELD COMPANY Free format text: MERGER AND CHANGE OF NAME;ASSIGNORS:ATLANTIC RICHFIELD COMPANY (MERGED INTO);ATLANTIC RICHFIELD DELAWARE CORPORATION (CHANGED TO);REEL/FRAME:004911/0380 Effective date: 19850314 Owner name: ARCO CHEMICAL COMPANY, 1500 MARKET STREET, PHILADE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ATLANTIC RICHFIELD COMPANY;REEL/FRAME:004911/0448 Effective date: 19870831 Owner name: ARCO CHEMICAL COMPANY,PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ATLANTIC RICHFIELD COMPANY;REEL/FRAME:004911/0448 Effective date: 19870831 |
|
AS | Assignment |
Owner name: ARCO CHEMICAL TECHNOLOGY, INC., A CORP. OF DE, DEL Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ARCO CHEMICAL COMPANY;REEL/FRAME:005010/0113 Effective date: 19880831 |